#!/usr/bin/python3
#-*-coding:utf-8 -*-
import RPi.GPIO as GPIO
import time

class AccData():
    def __init__(self,):
        # self.sign = 5 #最多重试5次
        pass
    def get_wearther_data(self,):
        
        channel = 24            #引脚号16  
        data = []           #温湿度值  
        j = 0               #计数器  
        
        GPIO.setmode(GPIO.BCM)      #以BCM编码格式  
        
        time.sleep(1)           #时延一秒  
        
        GPIO.setup(channel, GPIO.OUT)  
        
        GPIO.output(channel, GPIO.LOW)  
        time.sleep(0.02)        #给信号提示传感器开始工作  
        GPIO.output(channel, GPIO.HIGH)  
        
        GPIO.setup(channel, GPIO.IN)  
        
        while GPIO.input(channel) == GPIO.LOW:  
            continue  
        
        while GPIO.input(channel) == GPIO.HIGH:  
            continue  
        
        while j < 40:  
            k = 0  
            while GPIO.input(channel) == GPIO.LOW:  
                continue  
            
            while GPIO.input(channel) == GPIO.HIGH:  
                k += 1  
                if k > 100:  
                    break  
            
            if k < 8:  
                data.append(0)  
            else:  
                data.append(1)  
        
            j += 1  
        
        # print("sensor is working.")  
        # print(data)              #输出初始数据高低电平  
        
        humidity_bit = data[0:8]        #分组  
        humidity_point_bit = data[8:16]  
        temperature_bit = data[16:24]  
        temperature_point_bit = data[24:32]  
        check_bit = data[32:40]  
        
        humidity = 0  
        humidity_point = 0  
        temperature = 0  
        temperature_point = 0  
        check = 0  
        
        for i in range(8):  
            humidity += humidity_bit[i] * 2 ** (7 - i)              #转换成十进制数据  
            humidity_point += humidity_point_bit[i] * 2 ** (7 - i)  
            temperature += temperature_bit[i] * 2 ** (7 - i)  
            temperature_point += temperature_point_bit[i] * 2 ** (7 - i)  
            check += check_bit[i] * 2 ** (7 - i)  
        
        tmp = humidity + humidity_point + temperature + temperature_point       #十进制的数据相加  
        
        GPIO.cleanup()  
        if check == tmp:                               #数据校验，相等则输出  
            print("temperature : ", temperature, ", humidity : " , humidity)  
            return humidity,temperature
        else:                                       #错误输出错误信息，和校验数据  
            return -1,-1
            # print("wrong")  
            # print("temperature : ", temperature, ", humidity : " , humidity, " check : ", check, " tmp : ", tmp)  
        

if __name__ == "__main__":
    # Main()
    # time.sleep(1)
    # Main2()
    pass